Thank you, LillaBjorn, for letting me be part of your test group! The sweater is fun to crochet, and the pattern instructions are wonderful and make it easy to make a well-fitting seamless sweater!

The photos were a secret for quite a time, but now the pattern finally is released and I can show them!
Thank you, Petra, for funny photo shootings!

My annotations:

Gauge in main pattern with hook 4.0 mm: 25 sts / 25 rows = 10 x 10 cm - fabric is quite stiff and non-drapey
Gauge in main pattern with hook 4.5 mm: 23 sts/ 24 rows = 10 x 10 cm - fabric is soft and drapey

As I have to enlarge the 3X anyway, I choose the 4.5 mm hook.

Increase 1: Round 5: 8 repeats, total of 13 rounds
Colorwork 1: Round B 3/4: 8 repeats
Increase 3: Round B 3/4: 13 repeats
Last yoke round: no repeats

Total color B: used up 90 g = 380 m

started 3rd 100g-ball of color A on lower body

I made some slight changes:

When picking up sts over the short row slip stitches, I picked up the back loop of the stitch underneath as well, so there are no holes over the short row turning points.

Lower body:
I marked the underarm and made regular increases there for a slight A-line, increases by (sc, ch1, sc) into the underarm ch1, 4 times every 14th round, 2 times every 12 th round, then another 12 rounds.

Sleeves:
I started the sleeves differently by picking up 114 sts around the sleeve hole.
2nd round: sc3tog on the “corners” where the yoke meets the ch sts underneath the arm = 106 sts.
3rd round: sc2tog in these “corners” = 102 sts.
First sleeve decrease with the 8th round, then 7 times every 8th round decrease.
Then 5 decreases every 6th round, end with 2 rounds after the last decrease.

Neckline:
The neckline is quite wide, my friend wanted a narrower neckline.
This is what I did:
Start - 144 sts, divisible per 4 = 36 x 4
start in the middle of the back neckline with a standing fpdc
1st round: (2 fpdc, 2 bpdc), close round with sl st into first fpdc.
2nd round: every second pair of backposts is crocheted together with 1 bpdc around both posts of the previous round - ch2, (2fpdc, 2 bpdc, 2 fpdc, 1 bpdc around both post of the previous round) = 18 decreases, sl st into first fpdc.
3rd round: the remaining pairs of bpdc are crocheted together with 1 bpdc around both posts of the previous round - ch2, (2 fpdc, 1 bpdc around both posts of the previous round, 2 fpdc, 1 bpdc) = 18 decreases, sl st into first fpdc.
4th round: every second pair of frontposts is crocheted together with 1 fpdc around both posts of the previous round - ch2, fpdc aound both posts of the previous round, 1 bpdc, 2 fpdc, 1 bpdc) = 18 decreases, sl st into first fpdc.
5th round: the remaining pairs of fpdc are crocheted together with 1 fpdc around both posts of the previous round - ch2, (fpdc, bpdc, fpdc around both posts of the previous round, 1 bpdc, 1 fpdc, 1 bpdc) = 18 decreases, sl st into first fpdc.
6th round: ch1, sc in every st, make sc not too tight, close round with sl st into first sc.

Started 7th ball of Color A for the last 10 rounds of the second sleeve, used 14 g of it - with gauge according to pattern, length given in pattern, without the A-Line increases and without the additional 6 rounds on the neckline 6 balls of Color A will be enough.

Total color A: 6.14 balls = 2,456 m.